For this case we have to:
x: Represents the $ 0.25 game cards
y: Represents the $ 0.15 game cards
We have then:
From the second equation we have:
Substituting in the first equation:
So, I buy 8 game cards for $ 0.15
On the other hand we have:
So, I buy 12 game cards for $0.25
Answer:
Buy 8 game cards for $0.15
Buy 12 game cards for $0.25
Please pleas